Use these links to get the ISOs you will need to burn:
- CentOS 7 Live CD: http://mirror.csclub.uwaterloo.ca/centos/7/isos/x86_64/CentOS-7-x86_64-LiveGNOME-1511.iso
- CentOS 7 Full Install DVD: http://vault.centos.org/7.2.1511/isos/x86_64/CentOS-7-x86_64-DVD-1511.iso
There is also a second install DVD disk, but we won't be using it.